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How to Convert FBX to GLTF
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When Do You Need to Convert FBX to GLTF?
Converting FBX to glTF moves an asset out of a proprietary interchange format into the open one used by browsers, AR viewers and modern engines. It is the standard step before putting a model on the web.
What Happens When You Convert FBX to GLTF
Assimp reads the FBX and writes glTF. This pair maps better than most, because both formats can carry a scene graph, materials and animation. Geometry, UVs, node hierarchy and basic material properties come across. Animation support depends on how the FBX was authored, and complex rigs with constraints or custom controllers do not translate, since glTF supports skinned animation rather than an arbitrary rigging system. Materials are converted into glTF's physically based model and often need tuning.
Worth knowing before you convert
FBX has had several revisions and is not fully documented. Unusual or very old files can parse incompletely, so inspect the result rather than assuming.
About FBX and GLTF
application/octet-stream
FBX is a proprietary file format owned by Autodesk.
model/gltf+json
glTF is a file format for 3D scenes using JSON.
Conversion Notes
3D conversion from FBX to GLTF preserves mesh geometry, but features like rigging, blend shapes, physics constraints, or procedural modifiers may not transfer if the target format doesn't support them. Material definitions are mapped to the closest equivalent — PBR textures are preserved where the target format supports them, otherwise a best-effort approximation is applied.
Frequently Asked Questions
Simple skinned animation usually does. Rigs that depend on constraints, drivers or custom controllers do not, because glTF has no equivalent.